OCTOBER 19-20, 2012 - YMCA University of Science & Technology

Proceedings of the National Conference on
Trends and Advances in Mechanical Engineering,
YMCA University of Science & Technology, Faridabad, Haryana, Oct 19-20, 2012
Variation of UTS
Ultimate Tensile Stren
90
80
70
60
50
40
30
20
10
0
0 2 4 6 8 10
Spaecimen No
Series1
Graph 2: Variation of Ultimate Tensile Strength
Variation of % Elongation
Percentage Elongati
20
18
16
14
12
10
8
6
4
2
0
0 2 4 6 8 10
Specimen No
Series1
Graph 3: Variation of Percentage Elongation
3.1 Discussion on the tensile test results
In the present study the minimum limit of the parameters selected are 1400 rpm, 10 mm / minute welding feed
and 10 mm shoulder dia and the corresponding yield strength and ultimate strength in the specimen are 54.17
N/mm 2 and 74.17 N/mm 2 respectively. The maximum limit of the parameters selected are 2000 rpm, 20 mm /
minute welding feed and 20 mm shoulder dia and the corresponding yield strength and ultimate strength in the
specimen are 54.17 N/mm 2 and 79.17 N/mm 2 respectively. From these two results it is concluded that the
strength of the specimen are approximately same. It is because although with increase in rpm of the tool the
relative motion increases i.e. the frictional heat generated increases but at the same time with the increase in the
temperature the coefficient of friction µ decreases with increases in temperature and it leads to less heat
generated. In other words the frictional heat generated per unit area is remaining almost constant and it is
approximately 0.7 times the melting temperature of the alloy.
4. Conclusion
Defects free welds were produced on 4 mm thick aluminum alloy plates with FSW with rotational speeds of
1400 and 2000 rpm, travel speed of 10 mm/ minute and 20 mm/ minute and shoulder diameter 10 mm and 20
mm. Welded samples failed in the region corresponding to the base metal and demonstrated yield and ultimate
strength comparable to the base metal.
The Friction Stir Welded specimens have average UTS of 74.5725 N/mm 2 .
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